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SSH Inside & Out

Feb 22, 2012, 11:02 (0 Talkback[s])
(Other stories by Doug Vitale)

[ Thanks to Doug Vitale for this link. ]

"SSH is one of the protocols of the TCP/IP protocol suite found at the application layer (Layer 7) of the Open Systems Interconnection (OSI) network model. Officially specified in RFC 4251 (and later, several other RFCs) SSH functions in a way that is similar to telnet but is far more robust and capable. SSH lets you log in to other hosts, get a shell and execute commands on them (for more details, read up on the concept of the OS shell), and transfer files between hosts. The major difference between SSH and telnet as terminal emulation protocols is that SSH utilizes encryption and strong authentication while telnet transmits data (including passwords) in clear text, making it vulnerable to packet sniffing. SSH, in contrast, provides secure, reliable authentication and communication over data channels that might not be so trustworthy (such as the public Internet). Because the SSH protocol encrypts the communications between network devices, it decreases the chance of an attacker (possibly an internal user) sniffing traffic and obtaining sensitive data such as authentication credentials."

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